Guide thermometer



NOV.` 19, 1.929. H F SCHROEIDER 1,735,880

GUIDE THERMOMETER Filed July 25. 1927 INVENTOR.

A TTORNEYS .7 BY wmf/4 @77M Patented Nov; 19, 1929 narran stares HENRYn. sonnonnnn, or MILWAUKEE, Wisconsin, essIGNoR To MILW-Auknnfnn CASTINGoo., on MILWAUKEE, Wisconsin, VAconr.onnfrron or AWIscoMsI-N "GUIDETHERMOMETER Application led July 25, 1927. Serial No. 208,290'. 'l'

This invention relates to improvements in guide thermometers.

A study oit the habits of sh has revealed the tact that on torrid summerdays, they congregate near vthe bottom of the lake or river in thesections in which the water is the coldest to thereby escape the intenseheat. As a result of this, lishermen desire to anchor their boats overthese sections of cold water.'

It is one of the objects ot the presentinvention to provide aninstrument for de-l greater than the specilic gravity of water so thatit may be readily lowered to a point of considerable depth.

AV further Objectis to provide a guidev thermometer which will allow forexpansion f of the thermometer tube resulting from the y changesettemperature to'which the thermometer is necessarily subjected.

A further object is to provide a guide thermometer in .Which the stringvor other lowering means will be'protected at the point of attachment.

It is a further object'of invention toV provide a thermometer which isso con-A structed as to. guard against breakage when the instrumentcomes in contact with objects on the bottom of the lake.

It is a still further object otthis invention to provide a guidethermometer which is simple in construction, is durable, andis welladapted for thepurposev described.

With the Vabove and other objects in view,

Y the invention consists of the improved guide thermometer and all itsparts and combinations, or the equivalents thereof, asV hereinafter morefully pointed out.

In the drawing in whi h the same refer ence numerals designate thesameparts in all of the views:

Fig. 1 is an enlarged j front elevation of the improved guidethermometer; v

.f Fig.12is a vertical sectional view thereof, taken-on the line Qf-"Qot Fig. 1; and F 1g. 8 is a cross sect-ion t ken on the line B-SofFigl.--v Referring to the drawng,'the numeral l designates the outer casing,which is preferably constructed ot aluminum or o't'some material Vhavinga specific gravityy greater than water, and which has a front recessextending the greater part of its .'lengthin whichthe thermometer tube 6is positioned. The casing also has a lower end bore 7 enlarged'near thelower end 'of the casing yto accommodate rthe thermometer bulb 8. 'TheVbulbis vheld in place by a yielding cement orother sealing material asat 9, and a cored.V rubber plug 10 fills the space between the cementand the lower end of the thermometer casing. r The upper end of the tubekis* received `in a-n `upper recess 11 and is there anchored inplace byarubber sleeve 12. The recess is sufficiently large to allow forvertical' and horizontal eX- pansion of the tube. This eXpansionis boundtoocc`ur because of the sudden 'changes inl` temperature'to which theinstrument i-ssub.-l jected. `'llhe'yielding cement will also4 allow 1for expansionojt the tube. The Iupper'part i of the casing is taperedupwardly in the front and back to vform an eye 13 for attaching a.stringor wire by 'which the thermometer' is lowered .into the water.When laA string or otherlowering-{means is attached'to the eye 13 it isprotected by the taperedportionv516.1`

immediately below saideye trom-being cut or broken'. J This danger`ofthe string being. j .cutv would be especially prevalent if the in- Ystrument were allowed to liellat on the bottom ofthe lake. Y With thetapering construction, however, even when the instrument is in lahorizontal position, the string at the,

point of attachment will be kept off the bot. toml of the. lake. A'graduated' scaleV .14 is 1 marked out or otherwiselixedtothe recess 5Yadjacent to the thermometer tube.: Mercury 15 is'within the thermometerbulb and tube.

In use, the thermometer is merely lowered into the water by means of astring or wire until the' lower end .of it rests upon the bot-A l tomoit the lake. The water, of course, enters the opening in the coredrubber plug lO'and-v v tract the sh, then another spots tested 'until lcomes in contact with the thermometer bulb.` The instrument s allowed toremain in the water a sufficient length of time for the mercury toproperly record the temperatue, and then the nstrumentts withdrawn fromthe water and the recorded temperature read. If v the water is notdeemed cold Venough `toa'ta place where there yis water of the desiredutemperature sfound.` `4 Y p It will be seen that' the' thermometer s soconstructed thatvwater may come in Contact atv ' f lower end and'mounted; in said front recess,V thetube Vhavng'ts".'lrlppe'r enclintheupperr recessV and'Y its .lower"'end in" the lower end bore, thelower"portionv ofthe borev being en# withl the bulb, and still the bulbVis so protected that there s no danger lof ts'beng broken by reason ot'coming in contact with somel object on the bottom of the lake. The tubeis alsoprotected by being mounted with a recess` in the' easing.

What I cla-im is: v Y l.l A gufde thermometer comprising a easing havinga lower'end bore', a thermometer tube formed with a bulb at one endmounted in said casing, the lower end bore accommodating, the' bulb,`and a cored plug in the bore between the` bulb' and the' lower end ofthe Casing.

VEZ. A guide thermometer comprising a casha'vng a lower end bore, athermometer tube formed 'with a; bulb at one end. and

Vmounted in said. casng,the lower end bore accommodating tlresbulb,vsealing means be-` tween thebu-lb and. the sides/of the bore, and

a coredplugn thevbo're between said sea-ling meansiand the lower vend ofthecasing.

A guide thermometer'Comprising a casing hzw'rrgv af front;reee'ss,`said-casing also vllswnga lower'v end bore and an upper recess,

athermometer tube formed with a; bulb at its larged .toV 'aecommodatelvthe bulb, .a rubber sleeve 4inthe upper reeessV aV sealing ycementbetween the sides of` the bore and the bulbe and apcore'd rubber plug inthe bore between the'l sealing dement-and the lower end of theV casing.

- w HENRY. .SCHROEDER e n -Y nt'estrmony: whereof, I alxmy signature.A

